Protect, Enhance, and Save Lives - 1 - III ARDENT Annual Workshop 29/09-02/10/2014 IBA Dosimetry...

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Protect, Enhance, and Save Lives - 1 -

III ARDENT Annual Workshop

29/09-02/10/2014IBA Dosimetry

Francesca BiselloESR 10

OutlineResearch Activities

ConferencesTraining and Secondments

I. Research Activities

II. Conferences

III. Trainings and Secondments

Outline

Research Activities

Dosepix Characterization

General overview

Dosepix detector as Quality Assurance tool in diagnostics

0 10 20 30 40 50 600

Energy(keV)

Counts

kVp-meter in mammography

October 2013 – October 2014:

Dosepix as kVp-meter in mammographyRadiation Tolerance studiesTemperature characterization

Sum up of activities

Dosepix CharacterizationkVp-meter in mammography

o Image quality and dose depend on the xRay tube voltage

10 15 20 25 30 35 40 450

Energy (keV)

Tube setting: 30 kV, 20 mAs

Big Pixels

Tube setting: 30 kV, 20 mAs

Dosepix CharacterizationkVp-meter in mammography

o kVp: fitting the end point of the spectrum

20 22 24 26 28 30 32 34 3622

f(x) = 0.905925196214262 x + 3.35983643787807R² = 0.993008054945356

kVp MagicMax (kV)

20 22 24 26 28 30 32 34 360

kVp (MagicMAx) (KV)D

Additional filtration: 0.3mm CuCounts/big pixel/s: 1.5 · 104 Hz [ count rate without filtration : 5· 104 Hz ]

RadiationTolerance studies

10-28/02/2014Secondment at CERNRadiation Tolerance Studies

Measurement Session:Accumulated dose for the test: 5 kGy in step of 200 Gy Tube settings: 40 kV, 2 mA dose rate 4.83 Gy/min

Dosepix CharacterizationRadiation Tolerance studies

Poster Presention IEEE 2014, 8-15 November 2014 “Investigation on the radiation tolerance of Dosepix detector” F. Bisello, W.S. Wong , E.Frojdh , J.Alozy I. Ritter, A.Zang, M. Campbell, J.C.Celi, G.Anton and T.Michel

o Deeper analysis of effect around mammographic energieso Investigations in damages in the sensor or in the chip

Temperature Characterization

First Measurement Session: CERN (secondment)Addidtiona Investigations: IBA Dosimetry

Measurement Session:Range required by the regulation: 15°- 35 °CInstability < 1%

Dosepix CharacterizationTemperature Characterization

Source of instability (I):PLL circuit

Source of instability (II):Bias current of initial gain stage of

the discriminator

Next steps:

o Evaluate the possibility to bypass the PLL circuit

o Find other more stable configurations for the analog front end

Other Activities

SFD diodes

Machine and Plan QASmall Field external Radiotherapy

Other ActivitiesSFD diodes

Studies on sensitivity dependence from:

• Dose• Dose per pulse• Dose rate

Other ActivitiesSFD diodes

Oral Presentation, RESMDD14, 8-10 October 2014 “Development of silicon monolithic arrays for dosimetry in external beam radiotherapy”

F. Bisello, M. Bucciolini, M. Bruzzi, D. Menichelli, M. Scaringella, C. Talamonti, M. Zani1,2

Conference

Trainings

Secondments

Conferences 2014

DPG Mainz, 25th March 2014Oral Presentation “Characterization of the Dosepix detector under clinical conditions ”

RESMDD Florence, 8-10 October 2014Oral Presentation “Development of silicon monolithic arrays for dosimetry in external beam radiotherapy”

IEEE 2014 Seattle, 8-15 November 2014Poster Presentation “Investigation on the radiation tolerance of Dosepix detector”

Planned Training and Secondments

Business and Administration training, ST Microelectronics

Secondment at the UPENN University Hospital, Phyladelphia (tentative: 16-28 November 2014):

Measurements on plan QA with silicon monolithic array

Trainings on clinical quality assurance routine (to be defined)

Thank you very much for your attention

Protect, Enhance, and Save Lives - 1 - III ARDENT Annual Workshop 29/09-02/10/2014 IBA Dosimetry...

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